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Visible-light response hybrid aerogel and preparation method and application thereof in waste gas processing

a technology of aerogel and visible light, applied in the field of nano composite materials, can solve the problems of large reduction dose, difficult control, poor water soluble and reactive gas, etc., and achieve the effects of low cost raw materials, simple preparation process, and low cos

Active Publication Date: 2022-05-10
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]1. The invention adopts a simple and easy-to-operate hydrothermal method and freeze-drying method to obtain the silver metavanadate quantum dots / carbon nitride nanosheets / graphene hybrid aerogel composite photocatalyst, which has simple preparation process and low cost raw materials. It is easy to achieve large-scale production; carbon nitride has a band gap of about 2.7 eV and has high visible light photocatalytic performance; however, the prior art shows that photogenerated electrons and holes are easily recombined due to its narrow band gap. The invention modifies silver metavanadate quantum dots on carbon nitride to form a zero-dimensional / two-dimensional heterojunction, which inhibits the recombination of electron-hole pairs, and exerts synergistic redox effect; three-dimensional aerogels obtained after freeze-drying have a regular geometry and are not easily blown in the air and are easy to recycle.
[0027]2. The silver metavanadate quantum dots / carbon nitride nanosheets / graphene hybrid aerogel composite photocatalyst of the invention has a large specific surface area, uniform pore diameter and excellent electrical conductivity. The silver metavanadate quantum dots are adjustable in size, high in light stability, and can be uniformly loaded on carbon nitride nanosheets to disperse charge and promote transfer of photogenerated carriers; silver metavanadate quantum dots / carbon nitride nanosheets are uniformly dispersed on the graphene, which further promotes the transfer of photogenerated carriers, so that the fluorescence intensity of the system is significantly reduced. The gradual modification of the carbon nanosheets greatly enhances the ability of the photocatalytic treatment of exhaust gas.
[0028]3. The invention overcomes the problems of large reduction dose, serious secondary pollution and complicated operation in the treatment of exhaust gas by the traditional flue gas denitration technology. The photocatalytic oxidation method has mild reaction conditions, low energy consumption and high removal efficiency, which has been widely used in the field of pollutant degradation.

Problems solved by technology

In recent years, the rapid increase of global gas emissions and the almost saturation of environmental capacity have led to a series of regional and environmental issues such as photochemical smog, acid rain and ozone depletion.
Most of the exhaust gases are poorly water soluble and poor reactive, so it is difficult to control.
The flue gas denitration technology used at present has problems such as large reduction dose, serious secondary pollution, and complicated operation.

Method used

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  • Visible-light response hybrid aerogel and preparation method and application thereof in waste gas processing
  • Visible-light response hybrid aerogel and preparation method and application thereof in waste gas processing
  • Visible-light response hybrid aerogel and preparation method and application thereof in waste gas processing

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Experimental program
Comparison scheme
Effect test

embodiment 1

[0036]The preparation of carbon nitride nanosheets, the steps are as follows:

[0037]10 g of dicyandiamide is placed in a tube furnace and calcined under Ar gas atmosphere, and then heated to 550° C. for 4 h at a heating rate of 5° C. / min to obtain the bulk carbon nitride; the bulk carbon nitride is calcined in air, and heated to 550° C. for 2 h at a heating rate of 5° C. / min. The present invention uses calcination to obtain carbon nitride nanosheets with a large specific surface area. FIG. 1 is a Transmission electron microscopy image of the carbon nitride nanosheet.

embodiment 2

[0038]The preparation of silver metavanadate quantum dots / carbon nitride nanosheets is as follows:

[0039]Silver nitrate (0.0170 g, 0.1 mmol) is dissolved in 20 ml of deionized water using a foil-wrapped beaker, and then carbon nitride nanosheets (0.1 g) is added to the solution and stirred for 30 minutes, the obtained suspension is then sonicated for 1 hour. 20 ml of ammonium metavanadate aqueous solution (0.0117 g, 0.1 mmol) is added to the suspension by a disposable syringe (20 ml) at a rate of 60 ml / h, and then the pH is adjusted to neutral and sonicated for 1 hour, and stirred in an oil bath for 8 hours. Finally, it is washed three times with deionized water and absolute ethanol. The product is placed in an oven at 80° C. for 8 h to prepare silver metavanadate quantum dots / carbon nitride nanosheets, which is recorded as AVO-CN. According to the quality of the added carbon nitride nanosheets, the composite materials with different loading quality of silver vanadate can be obtained...

embodiment 3

[0040]Preparation of silver metavanadate quantum dots / carbon nitride nanosheets / graphene hybrid aerogel is as follows:

[0041]15 mg of graphene oxide is added to a glass bottle (20 ml) and 4 ml of water is added thereto to uniformly disperse, then 45 mg of AVO30-CN is added to the graphene oxide dispersion. After ultrasonic mixing, 30 mg of L-ascorbic acid is added, and the mixture is placed in boiling water for half an hour to form a hydrogel and immediately frozen in a −40° C. refrigerator for 40 min. After natural melting, it is placed in a boiling water bath for 8 hours, and finally freeze-dried in a freeze dryer for two days to obtain a regular shape of light aerogel hybrid silver metavanadate quantum dots / carbon nitride nanosheets / graphene, which is denoted as AVO30-CN-GA-75 (AVO30-CN mass fraction is 75 wt %). According to the quality of the addition of graphene oxide, aerogel with different AVO30-CN mass loading can be prepared, denoted as AVO30-CN-GA-50, AVO30-CN-GA-75, AVO30...

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Abstract

Visible-light response hybrid aerogel and a preparation method and application thereof in waste gas processing are disclosed. Dicyandiamide is taken as a precursor and is calcined in two times to prepare a carbon nitride nanosheet; the carbon nitride nanosheet is dispersed in water, silver metavanadate quantum dots are subjected to in-situ growth to prepare a silver metavanadate quantum dot / carbon nitride nanosheet composite material; the silver metavanadate quantum dot / carbon nitride nanosheet composite material and graphene oxide carry out hydrothermal reaction, and are then frozen and dried to prepare silver metavanadate quantum dot / carbon nitride nanosheet / graphene hybrid aerogel which is the visible-light response hybrid aerogel. The problems of large reduction dosage, serious secondary pollution, complexity in operation and the like generated when waste gas is processed by a traditional flue gas denitration technology are overcome.

Description

[0001]This application claims priority to Chinese Patent Application No.: 201810765790.0, filed on Jul. 12, 2018, which is incorporated by reference for all purposes as if fully set forth herein.FIELD OF THE INVENTION[0002]The present invention relates to the technical field of nano composite materials, in particular to a visible light response silver metavanadate quantum dot / carbon nitride nanosheet / graphene hybrid aerogel and its preparation and application in exhaust gas treatment.TECHNICAL BACKGROUND[0003]In recent years, the rapid increase of global gas emissions and the almost saturation of environmental capacity have led to a series of regional and environmental issues such as photochemical smog, acid rain and ozone depletion. Most of the exhaust gases are poorly water soluble and poor reactive, so it is difficult to control. The flue gas denitration technology used at present has problems such as large reduction dose, serious secondary pollution, and complicated operation.SU...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B01J35/10B01D53/00B01J6/00B01J27/24B01J35/00B01J37/04B01J37/08B01J37/32B82Y20/00B82Y30/00
CPCB01J35/10B01D53/007B01J6/004B01J27/24B01J35/004B01J37/04B01J37/08B01J37/32B01D2258/0283B82Y20/00B82Y30/00B01D53/86B01D2255/802B01D53/8628B01D2255/104B01D2255/20723B01D2255/90B01J35/0013B01J23/682B01J37/10B82Y40/00
Inventor LU, JIANMEICHEN, DONGYUN
Owner SUZHOU UNIV
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